Replace echo -e with printf for portable ANSI banners

dash (Debian's /bin/sh) doesn't support echo's -e flag: it prints "-e"
literally as text before processing the rest of the string's backslash
escapes. Every script's colored banner was affected. printf's escape
handling is POSIX-mandated and behaves identically under dash and bash,
so swap all 90 echo -e calls for printf, appending the trailing \n that
echo used to add implicitly.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

bin/webhook.sh

@@ -5,12 +5,12 @@
 # get the current position
 _cwd="$(pwd)"
 
-echo -e '\033[35m
+printf '\033[35m
  __      __   _    _  _          _
  \ \    / /__| |__| || |___  ___| |__
   \ \/\/ / -_) `_ \ __ / _ \/ _ \ / /
    \_/\_/\___|_.__/_||_\___/\___/_\_\
-\033[0m'
+\033[0m\n'
 
 # check for assets folder
 _assets="$_cwd/assets"